Joseph ay



J. W. PRALL.

LOCK GAP GLEATLESS ROOFING.

No. 397,093. Patented Jan. 29, 1889.-

ai e a c l vimeooeo 314 wt UNITED STATES PATENT OFFICE.

JOSEPH IV. PRAIIIJ, OF POMEROY, OHIO, ASSIGNOR OF TlIREE-FOURTIIS TO \V.G. DOIVNIE, OF SAME PLACE.

LOCK-CAP CLEATLESS ROOFING.

SPECIFICATION forming part of Letters Patent No. 397,093, dated January29, 1889.

Application filed December 15, 1888. Serial No. 293,682. (No model.)

To all whom it may concern.-

Be it known that I, JOSEPH \V. PRALL, a citizen of the United States,residing at Pomeroy, in the county of Meigs and State of Ohio, haveinvented certain new and useful Improvements in Lock-Cap OleatlessRoofing; and I do hereby declare the following to be a full, clear, andexact description of the invention, such as will enable others IOskilled in the art to which it appertains to make and use the same.

My invention has for its object the ready attachment and removal of itsparts or sections, the facility for fastening the same without the useof cleats, and the prevention of any leakage from snow or rain water;and it consists of a certain peculiar and novel joint, which forconvenience I style lock-cap, for connecting the metallic sheets orplates at their edges, all of which will more fully appear from thefollowing description.

In the drawings, Figure I shows a plan of the joint made according to myinvention, and Fig. 2 a cross-section of the same.

A indicates the metal sheet or plate, which is formed on each side withopen box-like portions .13 t, having the bends (l e f and the inclinedportions g, and made by bending the metal on forms, and which portions BO are made of substantially the same shape or contour and adapted to fitsnugly one over the other to make a tight joint, the natural spring ofthe metal and the peculiar bends employed being sufficient to securelyfasten the plates or sheets together. In the portion C, running from theouter inclined portion g, is a flat horizontal portion, 71, on a planewith the sheets, and which is adapted to be nailed or otherwise fastenedto the roof or other place to be covered to hold the roofing to place.

The operation of my invention will be clearly understood. I take a sheetor plate, No. 1, of any desired size and having my improved lock-capsthereon, and nail or otherwise secure the strip h to the place to becovered. I then take another one of my improved plates, No. 2, and bypressure spring the portion B over the already-fastened portion 0, andthen proceed to nail the other side of sheet No. 2', and so on until theplace is cov- 5o ered.

It is obvious that other designs of curved bends may be employed andstill be efficient for practicing my invention but I prefer thethree-leaf-clover style, as shown, for general purposes.

It will readily be seen that by using my lock-cap leakage is impossible,even if the snow was piled high upon the roof.

It will also be seen that my invention is ap- 6o plieable to sidings andceilings as well as roofs, and may be applied and removed with equalfacility wherever it may be placed.

I prefer to employ steel or iron plates or sheets in practicing myinvention; but any metal having sufficient spring may of course be used.

It will also be seen that no acute angles are used, where dirt cancollect and water settle and rust the metal.

I elaim 1. Metallic roofing consisting of the plates or sheets A, eachsheet being formed with the bent curved portions B (I, each ofthese'portions being made with the substantially semi- 7 5 circularbends d e f and inclined portions g, the portion O having also theextension 72, these portions B O being adapted by reason of the bends tolock each other and to be fast ened to a base by means of the portion h.

2. A lock-joint for metallic roofing, consisting of two portions, eachof which has substantially semi-cylindrical bends similarly disposed,and also the inclined portions g, and adapted to be sprung on'e upon theother, for the purpose described.

In testimony whereof I affix my signature in presence of two witnesses.

JOSEPH IV. PRALL.

\Vitnesses:

WILL. 'I. NORTON, GEo. G. PENNEY.

